Study On Laser Cladding Remanufacturing Process And Mechanical Properties Of Structural Parts Of Hydraulic Support

Hydraulic support as the core support equipment in underground mining,its reliability and stability is the key to ensure safe operation,hydraulic support economic input accounts for 60% of its working face complete equipment.Structural parts and mechanical parts are important parts of hydraulic support.Due to the harsh service environment and complex underground working conditions of hydraulic support,the parts of hydraulic support will be repaired due to failure after 1-3 years of use,resulting in a great waste of resources and economic losses.Because of its typical characteristics of adjustable energy input,small processing deformation and high process reliability,laser cladding technology shows excellent application value and prospect in solving the remanufacturing problems of high-value components.So,this academic paper in order to quick response of the hydraulic support structural damage after high performance repair application requirements as the background,cladding experiment research on Q690 materials,respectively analyzes the single channel,multichannel cladding quality affected by the influence law of process parameters,and parameter optimization,and finally to remanufacturing materials after researches on the main mechanical properties such as tensile strength of the summary,It provides theoretical basis and data support for high performance repair of hydraulic support structural parts.The main contents are as follows.Firstly,the single-channel laser cladding remanufacturing process of Q690 high strength steel for hydraulic support structure was studied and optimized.The influence of cladding parameters on the quality of single pass cladding layer was analyzed under single pass cladding experiment.Through the response surface method to model building of cladding layer morphology characteristics,this method can quickly predict remanufacturing of cladding layer after geometric features,based on this model,feeding speed,laser power,scanning speed,from coke as optimization variables,the minimum dilution rate and the maximum microhardness and using simulated annealing algorithm to process optimization,The optimal process parameters of single pass cladding were obtained and verified by experiments.Then,on the basis of single-channel cladding experiment,the remanufacturing process of multi-channel laser cladding was designed and optimized.Through an experimental study on the overlap rate on the influence law of multichannel cladding quality,on the basis of single-channel cladding process parameters added lap rate as a new independent variable,with average dilution rate and surface roughness as the optimization goal,through poor analysis respectively analyzes the influence law of various process parameters for a single index and the optimal parameter set,Multiobjective optimization was carried out by comprehensive scoring method,and finally the optimal process parameters of Q690 high strength steel laser cladding were determined and verified by experiments.Finally,the laser cladding remanufacturing of Q690 high strength steel was carried out based on the optimized multi-channel cladding process parameters,and the main properties were analyzed.The tensile properties,microhardness,impact strength and shear strength of the substrate and the material after laser cladding remanufacturing were compared and analyzed,and the main mechanical properties data of Q690 high strength steel after remanufacturing were obtained.